Physics – Quantum Physics
Scientific paper
2003-09-17
Phys. Rev. Lett. 92, 187902 (2004)
Physics
Quantum Physics
4 pages, 1 figure
Scientific paper
10.1103/PhysRevLett.92.187902
We propose a class of qubit networks that admit perfect transfer of any quantum state in a fixed period of time. Unlike many other schemes for quantum computation and communication, these networks do not require qubit couplings to be switched on and off. When restricted to N-qubit spin networks of identical qubit couplings, we show that 2 log_3 N is the maximal perfect communication distance for hypercube geometries. Moreover, if one allows fixed but different couplings between the qubits then perfect state transfer can be achieved over arbitrarily long distances in a linear chain.
Christandl Matthias
Datta Nilanjana
Ekert Artur
Landahl Andrew J.
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